package com.imooc.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

// 创建自定义助手类
// 对于请求来讲，其实相当于[入站,入境]
public class CustomHandler extends SimpleChannelInboundHandler<HttpObject> {


    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {

        System.out.println("channel  注册");
        super.channelRegistered(ctx);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel  移除");
        super.channelUnregistered(ctx);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel  活跃");
        super.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 不活跃");
        super.channelInactive(ctx);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel  读取完毕触发");
        super.channelReadComplete(ctx);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println("channel 用户事件触发");
        super.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel 用户事件 更改");
        super.channelWritabilityChanged(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("捕获到异常");
        super.exceptionCaught(ctx, cause);
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println("助手类添加");
        super.handlerAdded(ctx);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("助手类移除");
        super.handlerRemoved(ctx);
    }

    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {

        // 获取channel
            Channel channel = ctx.channel();

            if(msg instanceof HttpRequest){
                System.out.println(channel.remoteAddress());
            }


        // 定义发送的数据消息
        ByteBuf content = Unpooled.copiedBuffer("hello netty~", CharsetUtil.UTF_8);

        //构建一个http response
         FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK,content);

         // response 设置http 的头,版本信息，状态码，内容 buffer，然后把 response 用 上下文 ctx 写到客户端,这样handle 就处理完毕了
        // content-type  设置返回的数据类型

        // response 的 http 头类型
        response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
        response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());

        // 把数据写到缓冲区，并刷到客户端
        ctx.writeAndFlush(response);

    }
}
